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Practice Test: Question Set - 06
1. Shunt capacitance is neglected while considering
- (A) Short transmission line
- (B) Medium transmission line
- (C) Long transmission line
- (D) Medium and long transmission lines
2. Wave trap is used to trap waves of
- (A) Power frequencies
- (B) Higher frequencies entering generator or
transformer units
- (C) Either of the above
- (D) None of the above
3. Which of the following statements is incorrect?
- (A) Lightning arrestors are used before the
switchgear
- (B) Shunt reactors are used as compensation
reactors
- (C) The peak short current is (1.8 × V2)
times the A.C. component
- (D) The MVA at fault is equal to base MVA
divided by per unit equivalent fault reactance
4. The single phasing relays are used for the protection of
- (A) Single phase motors only
- (B) Two phase motors only
- (C) Two single phase motors running in parallel
- (D) Three phase motors
5. Admittance relay is ________ relay.
- (A) Impedance
- (B) Directional
- (C) Non-directional
- (D) None of the above
6. An isolator is installed
- (A) To operate the relay of circuit breaker
- (B) As a substitute for circuit breaker
- (C) Always independent of the position of
circuit breaker
- (D) Generally on both sides of a circuit breaker
7. The information to the circuit breaker under fault conditions is provided by
- (A) Relay
- (B) Rewirable fuse
- (C) H.R.C. only
- (D) All of the above
8. The arcing contacts in a circuit breaker are made of
- (A) Copper tungsten alloy
- (B) Porcelain
- (C) Electrolytic copper
- (D) Aluminium alloy
9. Relays can be designed to respond to changes in
- (A) Resistance, reactance or impedance
- (B) Voltage and current
- (C) Light intensity
- (D) All above
10. A differential relay measures the vector difference between
- (A) Two currents
- (B) Two voltages
- (C) Two or more similar electrical quantities
- (D) None of the above
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